- One new field "InternalTrafficPolicy" in Service is added.
  It specifies if the cluster internal traffic should be routed to all endpoints or node-local endpoints only.
  "Cluster" routes internal traffic to a Service to all endpoints.
  "Local" routes traffic to node-local endpoints only, and traffic is dropped if no node-local endpoints are ready.

// Specifies the sidecar's default behavior when handling outbound traffic from the application.
type OutboundTrafficPolicyConfig_Mode int32

const (
	// Outbound traffic to unknown destinations will be allowed, in case there are no services or ServiceEntries for the destination port
	OutboundTrafficPolicyConfig_ALLOW_ANY OutboundTrafficPolicyConfig_Mode = 0

	any NetworkPolicy whose spec.podSelector targets them. Pods that are
	targeted by NetworkPolicies accept traffic that is accepted by any of
	the NetworkPolicies (and nothing else), and pods that are not targeted
	by any NetworkPolicy accept all traffic by default.
	Action Required:
	When upgrading to Kubernetes 1.7 (and a network plugin that supports

- This change picks up the latest GCE pinhole firewall feature, which introduces destination-ranges in the ingress firewall-rules. It restricts the access to the backend IPs via allowing traffic via allowing traffic through ILB or NetLB IP only. This change does NOT change the existing ILB or NetLB behavior. ([#109510](https://github.com/kubernetes/kubernetes/pull/109510), [@sugangli](https://github.com/sugangli)) [SIG API Machinery, Architecture,...

- iptables proxier: now routes local traffic to LB IPs to service chain ([#77523](https://github.com/kubernetes/kubernetes/pull/77523), [@andrewsykim](https://github.com/andrewsykim))

### CVE-2022-3172: Aggregated API server can cause clients to be redirected (SSRF)

A security issue was discovered in kube-apiserver that could allow an attacker controlled aggregated API server to redirect client traffic to any URL.  This could lead to the client performing unexpected actions as well as leaking the client's credentials to third parties. 

- Fixing issue in Winkernel Proxier - Unexpected active TCP connection drops while horizontally scaling the endpoints for a LoadBalancer Service with External Traffic Policy: Local ([#114040](https://github.com/kubernetes/kubernetes/pull/114040), [@princepereira](https://github.com/princepereira)) [SIG Network]

- The `ProxyTerminatingEndpoints` feature is now Beta and enabled by default. When enabled, kube-proxy will attempt to route traffic to terminating pods when the traffic policy is `Local` and there are only terminating pods remaining on a node. ([#113363](https://github.com/kubernetes/kubernetes/pull/113363), [@andrewsykim](https://github.com/andrewsykim))

- Kube-proxy: fix a bug on UDP NodePort Services where stale conntrack entries may blackhole the traffic directed to the NodePort. ([#98305](https://github.com/kubernetes/kubernetes/pull/98305), [@aojea](https://github.com/aojea)) [SIG Network]

### Bug or Regression

	allErrs = append(allErrs, validateLoadBalancerClassField(nil, service)...)

	// external traffic policy fields
	allErrs = append(allErrs, validateServiceExternalTrafficPolicy(service)...)

	// internal traffic policy field
	allErrs = append(allErrs, validateServiceInternalTrafficFieldsValue(service)...)

	// traffic distribution field
	allErrs = append(allErrs, validateServiceTrafficDistribution(service)...)